A and B separately can complete a work in 6 days and 3 days respectively. If they work together, then in how many days will they complete the work?

4 days
3 days
2 days
5 days

Correct Answer: 2 days

Explanation:

Work completed by A + B in one day = 1/6 + 1/3 = 1/2
∴ Time taken by A + B to complete the work = 2 days.

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